In horizontal ventilation the tip should be placed on the ______ side and slightly ______ the window. This allows firefighters to vent a window without encountering heat, smoke, and falling glass.

In horizontal ventilation the tip should be placed on the ______ side and slightly ______ the window. This allows firefighters to vent a window without encountering heat, smoke, and falling glass.

• A. Windward; above
• B. Leeward; below
• C. Windward; beside
• D. Leeward; above

Answer: (A)

Horizontal ventilation works best when you create an exhaust path that uses both wind direction and buoyancy. Placing the vent tip on the windward side uses the oncoming air to push hot gases and smoke outward through the opening, rather than letting them swirl back toward the window. Doing this slightly above the window takes advantage of the natural rise of hot gases, so the hottest smoke exits first and away from the operator. This combination reduces exposure to heat, smoke, and any falling glass, keeping the firefighter farther from the immediate hazard at the window. If you vent on the leeward side, the wind would tend to push the exhaust back toward the opening and into the structure, which is less effective and more hazardous. Venting at or below window level would expose you to hotter, lower-level gases and debris.

Horizontal ventilation works best when you create an exhaust path that uses both wind direction and buoyancy. Placing the vent tip on the windward side uses the oncoming air to push hot gases and smoke outward through the opening, rather than letting them swirl back toward the window. Doing this slightly above the window takes advantage of the natural rise of hot gases, so the hottest smoke exits first and away from the operator. This combination reduces exposure to heat, smoke, and any falling glass, keeping the firefighter farther from the immediate hazard at the window. If you vent on the leeward side, the wind would tend to push the exhaust back toward the opening and into the structure, which is less effective and more hazardous. Venting at or below window level would expose you to hotter, lower-level gases and debris.